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Waves (D1.1 Waves Transfer Energy (Rope wave (Apply one force to rope,…
Waves
D1.1 Waves Transfer Energy
Materials and waves
Rope tied to doorknob, water, and round all have something in common: all materials through which waves move
Medium
Any substance that a wave moves through
Earthquake wave
Earthquake is sudden release of energy that has built up in rock as a result of surrounding rock pushing and pulling on it, when these two forces cause rock to break away and move, energy is transferred as a wave through ground
Water wave
Similar to dipping finger in water, water rushes back after removing, force of finger and force to water rushing back send waves across pool
Mechanical Waves
Waves that transfer energy through matter
Rope wave
Apply one force to rope, sends a wave through rope
Similar to rope tied to doorknob, both force that moves rope up and one that moves rope down are required to start a wave
Energy and waves
Forces and waves
A force is required to change the motion of an object
Forces can start a disturbance, sending a wave through a material
Waves can be classified by how they move
In earthquake, disturbed ground shakes from side to side and up and down as waves move through it, can travel kilometers away from source
In earthquake, kinetic energy, or energy of motion, is transferred
Wave
A disturbance that transfers energy from one place to another
Transverse waves
Can be classified by medium through which they travel and can also be classified by how they move, some transfer an up-and-down or side-to-side motion or forward-and-backward motion
A wave is a disturbance
Experience effects of waves every day (sound, light, water)
Longitudinal waves
D1.2 Waves have measurable properties
Wavelength
Frequency
Amplitude
How frequency and wavelength are related
Trough
Graphing wave properties
Crest
Wave speed can be measured? Calculated
Measuring wave properties
Speed equals wavelength times frequency
Waves have aplitude, wavelength, and frequency
D1.3 Waves Behave in Predictable Ways
Interference
Waves adding together
Waves interact with other waves
Constructive interference
Diffraction
Refraction
Waves cancelling each other out
Reflection
Destructive Interference
Wave interact with materials